For example, a person gets a stomach ache and different doctors all give the same diagnosis. There are several general classes of reliability estimates: Various kinds of reliability coefficients, with values ranging between 0.00 (much error) and 1.00 (no error), are usually used to indicate the amount of error in the scores.' įor example, measurements of people's height and weight are often extremely reliable. That is, if the testing process were repeated with a group of test takers, essentially the same results would be obtained.
Scores that are highly reliable are precise, reproducible, and consistent from one testing occasion to another. 'It is the characteristic of a set of test scores that relates to the amount of random error from the measurement process that might be embedded in the scores. A measure is said to have a high reliability if it produces similar results under consistent conditions:
In statistics and psychometrics, reliability is the overall consistency of a measure.
